use std::fmt::{self, Formatter, Display};

struct City {
    name: &'static str,
    lat: f32,
    lon: f32,
}

impl Display for City {
    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
        let lat_c = if self.lat >= 0.0 { 'N' } else { 'S' };
        let lon_c = if self.lon >= 0.0 { 'E' } else { 'W' };
        write!(f, "{}: {:.3}-{} {:.3}-{}", 
            self.name, self.lat.abs(), lat_c, self.lon.abs(), lon_c)
    }
}

#[derive(Debug)]
struct Color {
    red: u8,
    green: u8,
    blue: u8
}
impl Display for Color {
    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
        write!(f, "RGB ({}, {}, {}) 0x{:0>6X}", self.red, self.green, self.blue, 
        ((self.red as u32)<<16) | ((self.green as u32) << 8) | (self.blue as u32))
    }
}

pub fn main(){
    for city in [
        City {name : "Dublin", lat: 53.34778, lon: -6.259722 },
        City {name : "Oslo", lat: 59.95, lon: 10.74 },
        City {name : "Vancouver", lat: 49.25, lon: -123.1 },

    ].iter() {
        println!("{}", *city);
    }

    for color in [
        Color{ red: 128, green: 255, blue: 90 },
        Color{ red: 0, green: 3, blue: 254 },
        Color{ red: 0, green: 0, blue: 0 },
    ].iter(){
        println!("{:?}", *color);
        println!("{}", *color);
    }
}
